SSDs all have their own power management chips to manage their onboard voltage regulators. The flash memory itself is usually operating with 1.2V and/or 1.8V su

SSDs all have their own power management chips to manage their onboard voltage regulators. The flash memory itself is usually operating with 1.2V and/or 1.8V supply, and the SSD controllers are also in the neighborhood of 1V. Approximately nothing inside a modern PC uses 3.3V or 5V directly. Feeding 12V directly to the SSD won't make its power management circuits any more complicated or expensive, but it does get rid of the brown-out problem M.2 (3.3V) has with high-power drives.